Telephone-receiver



L. STEINBERGER.

TELEPHONE RECEIVER.

APPLICATION FILED FEB. 21. 1919.

1,366,606 Patented Jain. 25,1921.

Lg. ATTORNEY UNITEDYSTATES .LO'UIS'STEINBERGER, OF BROOK IN, NEW yank.

To all tvh o n. it mct j concern:

"Be itflniown that I, LOUIS STEIXBERGER, a citizen of the United-States, and a resident of the borough of Brooklyn, city and 'State ofXewYorkt have invented certain new and useful lm 'irovements 111 Telephone- Reeeivers oi? which the following is a speci' fication. h

My invention relates to telephone receivers wherein variations in the current flow- I ingthrou'gli a talking telephone circuit produce changes intlie magnetic flux emanating from a magnet, with concomitant changes, in the force exerted by the magnet upon a vibratory soft iron diaphragm operated thereby.

One of the objects of my invention is to provide an improved construction of receiver wherein the vibrations set up in the air by the vibrating diaphragm upon each of' its sides are utilized to set up sound waves which pass to the ear of the listener whereby a better speech reproducing effect is secured.

Another object of my invention is to provide an improved, receiver wherein the diaphragm is more free to vibrate than hasheretoi'ore commonly been the case, such end following 'frorn'th'e equalization of the air pressure upon two sides of the diaphragn'i which is a feature of the improved telephone .receiver wherein my invention con sists.

Another object of myinvention to provide a. receiver construction by means of which air passages extend from one side of thedi'aphragm to the other.

, Another object of the invention is to provide a receiver construction bymeans of which required air passages may be readily formed from the moldable material of which either the cap or the casing-is made.

Another object of my invention is to provide a cap structure for a telephone receiver having an annular air space inclosed therein adjacent the periphery of the diaphragm.

Another object of my invention is to provide a cap structure for a telephone receiver having an annular air space inclosed therein adjacent the periphery of the diaphragm.

and conduits leading from said air space to each side of "the diaphragm.

Mother objects will appear from the subjoined specification and claims.

Referring to the drawings forming a part of this specification in which:

. Specification of Letters lateht.

PATENT V YTELEPHON'E-RECQEIVER.

- Patel'ited Jan.

Application filed February 27, 1919. Serial No. 279,530.

F gure l is a view, for the most part in sectlon, upon a central longitudinally extending plane of a telephone receiver embodying my invention.

Fig. 2- is a view showing a section of the cap portion upon a transverse plane indicated by line 22 of Fig. 1. V

Fig. 3 is a view showing one end of a modified construction of the casing of the receiver in side elevation.-

Fig. & is a plan view of the modification of the casing shown in Fig. 3.

Fig. 5 is a plan view of the casing shown in Fig. 1. i

In the drawing .in which the same reference character indicates the same part in the several views. 5 designates the exterior casing of a telephone receiver, thesame being made either of electfrose, hard rubber or.

similar non-metallic insnlating material. and having an open end acrpss whiqa the vibrator v soft iron (llflPllI'ilQIIl 6 extends. The diaphragm is held in plnce by a cap 7 made of material similar tr that of which the casing isjmade and hating a threaded connection therewith at S {apart from the diaphragm. whereby a chamber 9 is provided between the cap T andEthe diaphragm 6. as clearly shown in Fig. 1. v

In-the preferred embodiment of my invention as shown in Fig. 1. a hollow cup shaped shell 1:2 of metal is located within and conforming generally with the shape of the upper interior portion of the casing. the

r open end "of avhich is closed by the-diato the screw threads at 8, as shown." Holes thin or perforations 18 are provided in the wall of the shell and are so located as to approximately extend between the upper face 15 of the casing and the underside of the flange 14 and thus establish a plurality of communic. ions between the interior of the shell constitnanug the chamber13 and the circumto abut against the diaphragm 5 and clamp it in place onthe flange 14 of the shell 12,- that is, the free ends of these lugs or teeth ferentially extending internal groove, recess or passage 19 formed within-the cap 7, at the periphery thereof.

As a modified construction the open end of the casing 5 may be mutilated, that is, may be provided with a lug or preferably with a plurality of lugs or teeth 10 spaced apart one from the other and arranged throughout the circumference of the open end thereof, as clearly shown in Fig. 3, thusforming openings 11 therebetween which leadfrom the chamber 13 through the holes 18 to the recess 19, as will be understood from the drawing. It is preferable, however, and in the interest of simplicity of construction and'elimination of costs in construction to make the upper face 15 of the. casing 5 smooth, thereby eliminating the formation of lugs thereupon.

' The cap 7 is provided with a lug or series of internal lugs or teeth 20 so arranged as engage the perimeter of the diaphragm and hold the partsthereof together when the receiver is assembled "and' secured. to the casing at 8,'- as will be understood. The spaces 21 thus formed between the lugs or teeth 20 are then in communication with the chamber 9 between the end wall of the cap and the front side or face of the diaphragm, I

and also with the passage 19 in the cap whereby a permanently open air passage is provided from the chamber. 9 at the front, side of the diaphragm to the chamber 13 at Fig. 3, it will be readily understood that the chamber on the underside of the diaphragm is in communication with the chamber on the upper side of the diaphragm and to the atmosphere through-the permanentlyv open air passage 0 in the wallof the cap. Of course, it will be understood that a single passageway from one side of the .diaphragm to the other is allthat is absolutely necessary, but it is preferable to provide more than one of such passageways. In theembodiment of my invention as shown, -I

I have provided aplurality thereof whieh are ordinarily present and which, as clearly seen, extend outwardly in a radial direction to the edge of the diaphragm and then within the scope ofmy invention it is intended that all matter contained in the above description orshown in the accompanying drawings shall be interpreted as illustrative and not in a limitin sense.

Having now descrlbed my invention, what I claim as new and desire to secure by Letters Patent is 1. In a telephone receiver, a suitable casing a series of spaced lugs or teeth upon its inner surface, and having an annular channel'outside of'said lugs or teeth;

'2. In a'telephone receiver, a suitable casing having an open end, a'series of spaced lugs or teeth arranged about said open end, a-cap in engagement with the open end of said casing and having a series of spaced lugs or teeth upon its innerv surface and so arranged as to lie opposite the teeth at the open end of said casing, a vibratory diaphragm the periphery of which is held ,in place between the teeth'upon said casingand the teeth upon said cap, the said cap having formed therein a circumferentially extend ing groove with which the spaces between the teeth or lugs upon both said casing and said cap communicate.

, 3. In a telephone receiver, a suitable casing having an open end and a sloping inner wall extending from and below said open end, a vibratory diaphragm extending entirely across the open end of said casing, a hollow shell seated on said sloping wall and extending beyond the open end of said casing and having anopen end across which said diaphragm extends whereby an internal chamber is provided. upon therear face of said diaphragm, a cap secured tothe open end of said casing and having an end wall spaced apart from s 'id diaphragm whereby a chamber is provided between the said end wall and the front face of said diaphragm, and a permanently open air passage extending from one of said chambers around the edge of the diaphragm and into the other chamber, the said diaphragm being held in place between the cap and the upper face of said casing.

4. In a telephone receiver, a suitable cas-v mg having an open end, a series of spaced lugs orteeth arranged about said open end,

a hollow shell located within said casing and having an open end, a peripherally extenddoWnwardHand ast; or around the edge": ing'flange upon the free ends of the mentwith theopen end of said casing and having a series of spaced lugs or teeth upon its inner surface and so arranged as to lie pposite the teeth at the open'endof said ca'sin'g, a vibratory diaphragm the periphery of which is held in place between the." flange aforesaid and the teeth carried bysaid cap, a

circumferentially extending groove provided within said cap at-the periphery thereof and v with which thespaces between the teeth or when it is secured to said casing.-

lugs vupon both said casing andsaid cap communicate, and holes provided'in the wall of said hollow shell and so arranged as to communicate with the spaces between the teeth at the open-end of said casing.

5. In a telephone receiver, a suitable casing having an open end, acap in, threaded engagement with the open end of said casing having a series of spaced'lugs or teeth upon its inner surface, and having. an annular channel outside of said lugs or teeth end-of the casing provided, with openings therein situated above the upper end of the casing, a vibratory diaphragm the periphery of which is'held in lace between the teeth or lugs upon the sairfcapand the upper end of thesaid shell, the said cap having -pro-' vided therein a .circumfer'entially extending groove with which the spaces between the in the shell communicate.

7. Ina telephone receiver, a cap provided with means for engagement with the casing,

said cap being mutilated upon its inner sur-' teeth or lugsof the cap and the openings face, said mutilatlons forming air passages therebetween, and anair space in said cap outside of said mutilated surface with which said air passages communicate.

' 8. 'In a telephone receiver, a vibratory diaphragm, a cap and a casing, means for securing'thecap, diaphragm and casing together, said cap having an annular chamber formed .within the wall thereof, and means for establishing air communication between said chamber and the central portion of said cap,

phragm, the casing having a chamber provided therein on the other side of the diaphragm, the cap being provided with a groove or chamber at the periphery'o f the diaphragm, said chambers having air com municatlons therebetween.

lOVIna telephone receiver; a cap, .diaphragm and easing, means for securing the same together, the said cap having a chamber provided therein on one side of the diaphragm, the casing having a chamber'provided therein on'the other, side of the diaphragm, the cap being provided with a groove-or chamber at the periphery of the diaphragm, said chambers being connected for the assage of air therethrough to each side of t e diaphragm.-

In witness whereof, I have hereunto set my hand at the borough of Manhattan, city and State of New York, this 19th day of February,,1919.--

LOUIS STEINBERGER.

Inpresence of C. C. Bnmnes. 

